Historical Rules · 15 July 2011
Rule 602.4
Official source text from the 15 July 2011 Rules release
Activating an ability that alters costs won't affect spells and abilities that are already on the stack.
Historical Rules · 15 July 2011
Official source text from the 15 July 2011 Rules release
Activating an ability that alters costs won't affect spells and abilities that are already on the stack.